lil help? I bought a one octave bass pedal made by Fast forward designs...guessing late 80's early 90's....they work flawlessly on my ctk 691 but with the wk1800 i only get piano tone. unless I assign the bass pedals to channel 10. then I get drums. Can I program the wk1800 to send/receive differently? would an interface device help? ....Tech support is no help